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This is a common species of hard limestone with globose discs (perithecia) in sunken pits. The perithecia are generally larger (to 0.8mm diam.) than in other common species (for example, V. baldensis) in the same habitat. The thallus is variably pale grey to grey-green or even red-tinged. It is common in suitable limestone habitats, including man-made structures throughout Ireland. The empty (albeit for bits of disc which stick to the base), rather stout pits left after the perithecia have died are also characteristic.
Original text submitted by Simon Davey